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# P3 Differentiation watch

1. Could some one please do this for me, I am not sure what to do with it, should i just use the chain rule?
x^2 (4x+1)^.5
Thanks
2. product rule and chain rule.
3. d/dx x^2 (4x+1)^0.5

= x^2*2(4x+1)^-0.5 + 2*x(4x+1)^0.5
4. (Original post by droid)
Could some one please do this for me, I am not sure what to do with it, should i just use the chain rule?
x^2 (4x+1)^.5
Thanks
ok so its first x differential of second plus second x differential of firsta=

a = x^2
a` = 2x
b = (4x+1)^.5
b` = 1/8(4x+1)^-.5

dy/dx = ab` + a`b
= 1/8x^2(4x+1)^-.5 + 2x(4x+1)^.5

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